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An Analytical Review on the Seepage Behaviour of Plastic Reinforced Soil
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This review paper summarizes existing research on mixing waste plastic strips, chips, flakes and pellets into soil to study how it affects water seepage and resistance to erosion. One cited lab study found that adding 2.0% recycled HDPE plastic pellets to silty sand raised the critical hydraulic gradient from 2.0 to 3.4, while 1.5% flakes gave a smaller increase.
ABSTRACT Seepage through soil governs the safety of earth embankments, levees, dykes, canal structures and earth dams. Excessive seepage raises hydraulic gradients, transports fine particles and may initiate internal erosion or piping. At the same time, the growing volume of plastic waste demands sustainable reuse routes. This review examines the use of waste plastic in the form of strips, chips, flakes and pellets as a random reinforcement in soil, with particular emphasis on seepage behaviour, permeability and resistance to piping. The fundamentals of seepage, Darcy’s law, hydraulic conductivity and the factors controlling flow are presented, followed by the preparation of soil–plastic mixtures, the mechanisms of soil–plastic interaction and the laboratory methods used to evaluate hydraulic response. Results reported by Devipriya et al. (2022) for silty sand mixed with recycled HDPE are analysed in detail: 2.0% plastic pellets raised the critical hydraulic gradient from 2.0 to 3.4 (an 80% increase), while 1.5% flakes gave an increase of about 40%, and the benefit diminished beyond the optimum content because of non-uniform mixing. Studies on strength, compressibility and pavement behaviour are also summarised. Applications, environmental benefits, limitations, research gaps and future scope are discussed. The review concludes that plastic inclusion is a promising, sustainable means of improving piping resistance, provided that the optimum content is established experimentally for each soil and plastic and validated at field scale. Key words: Seepage; Plastic reinforced soil; Waste plastic; HDPE; Permeability; Critical hydraulic gradient; Piping; Embankment
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